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A144796 Expansion of x(5+215x-1253x^2-23x^3)/((1+34x+x^2)(1-34x+x^2)). 2
5, 215, 4517, 248087, 5212613, 286292183, 6015350885, 330380931095, 6941709708677, 381259308191447, 8010726988462373, 439972911271998743, 9244372002975869765, 507728358348578357975, 10667997280707165246437 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The original definition "Numbers n such that (n^2-17)/2 is a square" describes A077242. - R. J. Mathar, Nov 27 2011

LINKS

Table of n, a(n) for n=1..15.

FORMULA

a(n)=1154*a(n-2)-a(n-4).

MATHEMATICA

Rest[CoefficientList[Series[x (5+215x-1253x^2-23x^3)/((1+34x+x^2)(1-34x+x^2)), {x, 0, 30}], x]] (* or *) LinearRecurrence[{0, 1154, 0, -1}, {5, 215, 4517, 248087}, 30] (* Harvey P. Dale, Apr 04 2014 *)

PROG

(PARI) Vec(x(5+215*x-1253*x^2-23*x^3)/((1+34*x+x^2)*(1-34*x+x^2))+O(x^99)) \\ Charles R Greathouse IV, Sep 26 2012

CROSSREFS

Sequence in context: A055316 A203470 A165208 * A206457 A119657 A235456

Adjacent sequences:  A144793 A144794 A144795 * A144797 A144798 A144799

KEYWORD

nonn,easy

AUTHOR

Richard Choulet, Sep 21 2008

STATUS

approved

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Last modified December 27 16:08 EST 2014. Contains 252672 sequences.